Question 1

regexpu vs Babel for Unicode regex transpilation

Accepted Answer

regexpu is the engine Babel uses internally for Unicode regex transpilation, so Babel provides a more comprehensive ES2015+ transpilation suite, while regexpu is focused solely on regex transformations for custom tools or integrations.

Question 2

How to use regexpu with Node.js for transpiling code

Accepted Answer

Install regexpu via npm and use the transpileCode function to rewrite entire source strings, or integrate rewritePattern for individual regex patterns, following the API examples in the README for ES5 compatibility.

Question 3

Does regexpu support Unicode property escapes

Accepted Answer

Yes, but it's experimental; enable it via the unicodePropertyEscape option in functions like transpileCode, allowing use of patterns like \p{Script=Greek} in ES5 environments, though stability may vary.

Question 4

Why does regexpu not transpile RegExp('...', 'u')

Accepted Answer

regexpu only handles regex literals because transpiling dynamic RegExp constructors would require runtime analysis and wrapping, which is outside its scope as a static source code transpiler, as noted in limitations.

Question 5

How accurate is regexpu's transpilation for emoji matching

Accepted Answer

It's highly accurate for most cases, correctly transpiling ranges like [💩-💫] to equivalent ES5 patterns, but has edge-case limitations with lone surrogates and certain flag combinations, per the documentation.

Question 6

Can I use regexpu without all its dependencies to reduce size

Accepted Answer

Yes, you can import specific modules like regexpu-core for rewritePattern or regexpu/transform-tree for AST transformations, avoiding heavier dependencies like Esprima, as suggested in the API section.

regexpu

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